A. NAD+ is reduced to NADH during glycolysis and Krebs cycle
B. NAD+ contain more energy than NADH
C. NAD+ is reduced through dehydrogenase action
D. NAD+ can receive electron for oxidative phosphorylation
E. Without NAD+, glycolysis will not occur

My answer: C

7. In eukaryotic cells with high glucose and oxygen content, mitochondrial proton gradient is generated by____________ and used for ____________